单项选择题

He demanded that we explain why things went wrong,______

A．hadn’t we
B．didn’t we
C．hadn’t he
D．didn’t he
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单项选择题
______ student with a little common sense should be able to answer this easy question.
A．Each
B．Either
C．Any
D．One
单项选择题
None of us saw him at the party. He ______ it.
A．mustn’t attend
B．can’ t have attended
C．needn’t have attended
D．wouldn’t attend
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